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Related Experiment Video

Updated: Jun 19, 2026

Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
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Published on: August 18, 2020

Does cannabis use affect prospective memory in young adults?

Janice Bartholomew1, Steve Holroyd, Thomas M Heffernan

  • 1Cognition and Communication Research Centre, School of Psychology and Sport Science, Northumbria University, Newcastle upon Tyne, UK. janice.bartholomew@northumbria.ac.uk

Journal of Psychopharmacology (Oxford, England)
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Summary

Young adults using cannabis showed significant prospective memory deficits in a video task, recalling fewer details than non-users. These cannabis-related memory impairments may go unnoticed by users.

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Area of Science:

  • Neuroscience
  • Psychology

Background:

  • Prospective memory is crucial for daily functioning.
  • Cannabis use is prevalent among young adults.
  • Potential cognitive impacts of cannabis use require investigation.

Purpose of the Study:

  • To investigate prospective memory impairments in young adult cannabis users.
  • To compare memory performance between cannabis users and non-users.
  • To assess awareness of memory deficits in cannabis users.

Main Methods:

  • Independent measures design with existing groups of cannabis users and non-users.
  • Participants: 90 UK undergraduates.
  • Measures: Prospective Memory Questionnaire, video-based prospective memory task, memory strategies, anxiety, depression, and other substance use.

Main Results:

  • No significant difference in self-reported prospective memory failures.
  • Cannabis users recalled significantly fewer location-action combinations in the video task.
  • Controlled for anxiety, depression, and other substance use.

Conclusions:

  • Cannabis use is associated with objective prospective memory deficits in young adults.
  • Young adult cannabis users may underestimate their memory impairments.
  • Further research needed to understand the long-term effects and awareness of cannabis-related memory deficits.